* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html,
body {
  width: 100%;
  height: 1005;
  font-family: '楷体';
  font-size: 16px;
}

#main {
  width: 400px;
  height: 300px;
  border: 1px solid #DCDFE6;
  margin: 40px auto;
  border-radius: 6px;
  padding: 20px;
}

#main>h3,
#main>p {
  width: 100%;
  height: 40px;
  line-height: 40px;
}

.dropbtn {
  color: black;
  padding: 16px;
  font-size: 24px;
  border: none;
  cursor: pointer;
  background: white !important;
}

#myInput {
  border-box: box-sizing;
  background-image: url("");
  background-position: 14px 12px;
  background-repeat: no-repeat;
  font-size: 16px;
  padding: 14px 20px 12px 45px;
  border: none;
}

.dropdown {
  position: relative;
  display: inline-block;
}

.dropdown-content {
  display: none;
  position: absolute;
  background-color: #f6f6f6;
  min-width: 230px;
  overflow: auto;
  box-shadow: 0px 8px 16px 0px rgba(0, 0, 0, 0.2);
  z-index: 1;
}

.dropdown-content a {
  color: black;
  padding: 12px 16px;
  text-decoration: none;
  display: block;
}

.dropdown a:hover {
  background-color: #ddd;
}

.show {
  display: block;
}